Improvement in electric fuses



UNITED STATES PATENT OFFICE.

vcumulus A. BEOWNE AND IsAAc s. BROWNEOE NORTE ADAMS, MAss.

IMPROVEMENT IN ELECTRIC FusEs.

Specification forming part of Letters Patent No. 158,672, datedJanuary-112,187@ application filed August 22, 1874.'

- To all whom t'may concern:

. p Be it known that we, CHARLES A. BRoWNE and ISAAC S. BROWNE, ofNorthAdams, in

the county ot' Berkshire and State of Massachusetts, have invented a newand useful Imi provement in ElectricFuses, of Which the following is aspecification:

kThe invention relates to electric fuses, consisting of a shell havingvwiresinpacking, and

attached to a second shell or cup containing the explosive compound.Iparing these for ,transportation and subse- It consists inp'requent.consumption, as hereinafter scribed.`

The drawing represents our improved fuse in two sectional elevations.

In the construction ot our improved fuse fully de- We make use of ametal tube, A, Fig. l, open lat both ends about three-tburths ot' aninch in length. This tube having been placed overa pin Whose diameter isequal to the inside diameter vof the tube A, and of the properlength---say, one-fourth ot' the entire length of the tube A--theextremities ot'- two insu lated Wires, B B, are inserted in the upperend yof the tube A, and rest in two small holes correslmnding` in sizeto the diameter ot' the wire. Theseholes are about one-sixteenth of aninch apart in the end of the pin,wl1ich. serves as a gage to separatethe terminals of the fuse-wires B B the proper distance. The

material.

inserted in af'second tube, A, having acharnber corresponding with `andfor the same purpose as in the first manner mentioned.

.To the consumer an opportunity is thus at'- forded of examining thefuse;wires to see that they are in `proper adjustment before insertingthe priming-charge, which is not the case when the second 0r fulminatingcharge and primingcliarge are securedin single shell' Witha closedbottom, and the fuse-Wires inserted after the priming-charge. Again, theindependent fuse, consisting` of tbe tube A with the wires B B attached,and the priming secured in the chamber I), are perfectly safe totransport, there being not enough force in the priming alone tocause,it` by chance one ot' them should explode, the explosion ot' otherfuses with which it might be in contact.

When ii'idepcndent fuses are shipped in this manner, the outer or secondcap'eontaining the fulminate charge ca n'be shipped in a wet state, andthen dried and attached by the consumer to the independent fuse.

Having thus described our invention, We claim as new and desire tosecure by Letters Patente 'Y The tube A, having Wires a a in a packing,O, and provided'with open-ended chamber for the priming'.

CHARLES A. BROWNE. ISAAC S. Bit() WNE. Witnesses:

GEO. L. RICE, JOHN A. RICE.

Or the insulated Wires B B can be first secured to a tube, a, Fig. 2,and this tube

